Performance

Tools for identifying the performance of web application

1.YSlow

2.Page Speed

These are browsers add-on very useful for performance measure, you can download them from below links - 

For YSlow - https://addons.mozilla.org/en-US/firefox/addon/yslow/?src=search

Page Speed:http://code.google.com/speed/page-speed/download.html

There are some best practices for Speeding Up Your Web Site

You can see those practices here .